Do it myself. I skin as soon as I hang to ensure the entire carcass cools. I hang mine in a garage or shed so no worry about direct sunlight, dirt, etc. Skin over will result after a couple days hanging, though mine are cut and wrapped within 48 hours as I see no benefit to aging venison. If the deer skins over it really isn't a big deal you'll just need to trim the exposed portions off when doing your specific cuts. IMO better than keeping the body temerature in longer by not skinning, rots from the inside out. I remove the tenderloin immediately as they skin over quickly and benefit nothing from hanging.